Bulletin of the Bureau of Standards, Vol. 11, 591-605 (1915) Scientific Paper 242 (S242)
Part I of this work dealt with the emissivity of nickel oxide. The micropyrometer, an instrument for the determination of the monochromatic emissivities of metals, etc., in microscopic quantities, has already been described. The authors now explain the use of the instrument for comparing the emissivity of a substance with that of Pt, where /b e/ = 0.33 for lambda = 0.650 mu, and /b e/ = 0.38 for lambda = 0.547 mu. The micropyrometer is brought alternately to the same brightness as a Pt strip and the surface whose emissivity is sought, the latter resting on the Pt strip as the temperature is raised. The apparent temperatures of the surfaces are then measured in succession. The emissivity E%2
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